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Home Coronavirus Infection of covid-19 can be transmitted by asymptomatic individuals during speech

Infection of covid-19 can be transmitted by asymptomatic individuals during speech


Infection of covid-19 can be transmitted by asymptomatic infected people during speech, researchers have revealed, who recommend the use of a mask and visor in close situations such as going to a consultation or to the hairdresser.

Most studies focus on the flow of exhaled air through coughing or sneezing, which can send aerosols over long distances. However, talking close to each other is also a risk, since the virus can be transmitted through speech.

In a statement, the American Institute of Physics, concerning the study published in the Physics of Fluids scientific bulletin, Japanese scientists used smoke and laser light to investigate the flow of air expelled near and around two people, while talking in various common contexts, such as hairdressing salons, medical clinics or long-term care units.

In that investigation, electronic cigarettes were used to produce artificial smoke, containing droplets about a tenth in diameter, similar to the size of a virus particle.

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The liquid used in these vaporization devices, a mixture of glycerin and propylene glycol, produces a cloud of tiny droplets that scatter light from a laser, allowing you to view airflow patterns. “We analyzed the characteristics of the diffusion of air exhalation with and without a mask when the person was standing, sitting, facedown or lying face up”, disse a autora Keiko Ishii.

To study the effect of speech on exhalation, the word “onegaishimasu”, a typical Japanese greeting in business settings, was pronounced repeatedly during the filming of the resulting vapor cloud.




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Source link
https://www.dn.pt/sociedade/infecao-de-covid-19-pode-ser-transmitida-por-assintomaticos-durante-a-fala-13383563.html


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